Label1.Text=ConvertSum("数字字符串");

        其代码如下：

/// 转换数字金额主函数（包括小数）           ///           /// 数字字符串           /// 转换成中文大写后的字符串或者出错信息提示字符串           public string ConvertSum(string str)           {                if(!IsPositveDecimal(str))                return "输入的不是正数字！";                if(Double.Parse(str)>999999999999.99)                return "数字太大，无法换算，请输入一万亿元以下的金额";                char[] ch=new char[1];                ch[0]='.'; //小数点                string[] splitstr=null; //定义按小数点分割后的字符串数组                splitstr=str.Split(ch[0]);//按小数点分割字符串                if(splitstr.Length==1) //只有整数部分                return ConvertData(str)+"圆整";                else //有小数部分                {                     string rstr;                     rstr=ConvertData(splitstr[0])+"圆";//转换整数部分                     rstr+=ConvertXiaoShu(splitstr[1]);//转换小数部分                     return rstr;                }           }

///           /// 判断是否是正数字字符串           ///           /// 判断字符串           /// 如果是数字，返回true，否则返回false           public bool IsPositveDecimal(string str)           {                Decimal d;                try                {                     d=Decimal.Parse(str);                }                catch(Exception)                {                    return false;                }                if(d>0)                return true;                else                return false;           }

///           /// 转换数字（整数）           ///           /// 需要转换的整数数字字符串           /// 转换成中文大写后的字符串           public string ConvertData(string str)           {                string tmpstr="";                string rstr="";                int strlen=str.Length;                if (strlen<=4)//数字长度小于四位                {                     rstr= ConvertDigit(str);                }                else                {                     if (strlen<=8)//数字长度大于四位，小于八位                     {                          tmpstr=str.Substring(strlen-4,4);//先截取最后四位数字                          rstr=ConvertDigit(tmpstr);//转换最后四位数字                          tmpstr=str.Substring(0,strlen-4);//截取其余数字                          //将两次转换的数字加上萬后相连接                          rstr= String.Concat(ConvertDigit(tmpstr)+"萬",rstr);                          rstr=rstr.Replace("零零","零");                     }                 else                 if(strlen<=12)//数字长度大于八位，小于十二位                 {                      tmpstr=str.Substring(strlen-4,4);//先截取最后四位数字                      rstr=ConvertDigit(tmpstr);//转换最后四位数字                      tmpstr=str.Substring(strlen-8,4);//再截取四位数字                      rstr= String.Concat(ConvertDigit(tmpstr)+"萬",rstr);                      tmpstr=str.Substring(0,strlen-8);                      rstr= String.Concat(ConvertDigit(tmpstr)+"億",rstr);                      rstr=rstr.Replace("零億","億");                      rstr=rstr.Replace("零萬","零");                      rstr=rstr.Replace("零零","零");                      rstr=rstr.Replace("零零","零");                 }                }                strlen=rstr.Length;                if (strlen>=2)                {                     switch(rstr.Substring(strlen-2,2))                     {                          case "佰零":rstr=rstr.Substring(0,strlen-2)+"佰"; break;                          case "仟零":rstr=rstr.Substring(0,strlen-2)+"仟"; break;                          case "萬零":rstr=rstr.Substring(0,strlen-2)+"萬";break;                          case "億零":rstr=rstr.Substring(0,strlen-2)+"億";break;                     }                }                return rstr;           }

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